Blinking Emission Objects
There are two ways you could go about this:


Animate Emission Strength (This is the better option)
Using an Animated Texture


Hover of the strength of your emission shader and press I. Then skip a couple of frames and make strength 0 and again press I. Keep on doing this and adjust as you wish to get the wanted result.
The texture could be made inside Blender using the compositor or in Photoshop (requires you to do it frame by frame).